Burglar-alarm.



BURGLAR ALA APPLICATION men JUNE 27.1918.

Patented Feb.18,,.19119.

UNITE git SOLOMON BROOK, OF BRONX, NEW YORK.

BURGLAR-ALARM.

To all whom g't may concern:

Be it known that I, SOLOMON BROOK, a citizen of United States of America, residing at Bronx, in the county of Bronx and State of New York, have invented new and useful Improvements in Burglar-Alarms, of which the following is a specification.

This invention relates to burglar alarms and has for its primary object the provision of a device of this character which will be operated by detonation, means to be employed whereby the device will be adapted for use upon sliding window sashes or like movable structures so that when one sash is adjusted with respect to the other a detonator or percussion cap will be instantly exploded to scare off an intruder.

Another object of the invention is to pro vide a device of this character which will be simple of construction, positive of action and of a design whereby it can be applied to the sash without requiring material alterations in the construction thereof.

With the above and other objects in view which will appear as the nature of the invention is better understood, the same con sists in the improved construction and novel arrangements of parts which will hereinafter be'fully described and particularly pointed out in the claims.

In the accompanying drawings has been illustrated, a single and preferred form of the invention, it being, however understood that no limitations are necessarily made to the precise structural details therein exhibited, but that changes, alterations and modifications within the scope of the claims may be resorted to when desired.

Figure 1 is a perspective view of a window frame construction showing portions of the upper and lower sashes and illustrating the application of the invention thereto.

Fig. 2 is a perspective view of the device removed from the sash.

Fig. 3 is a vertical section therethrough showing the companion sashes, the detonatingarm and hammer being shown in their normal positions in full dotted lines.

he device is particularly applicable to sliding window sashes and is designed to give an audible warning when the sashes are moved relatively by an unauthorized person or intruder.

he application of the invention is fully shown herein wherein a frame construction A is provided with usual upper and iower Specification of Letters Patent. Application filed June 27, 1918.

Patented Feb. 18, 1919. Serial No. 242,196.

sliding sashes B and C. To the upper rail of the lower sash is secured by screws or equivalent fastenings 5. A base plate 6, the same having an integral vertical arm or branch 7, vertically disposed and arranged 1n parallel relation to the side of the upper It is bifurcated at 8 to accommodate a rocking detonating arm 9 which is supported between the arms of said bifurcated portion by a suitable pin 10. The arm is provided with a short tail 11 having a curved surface 12 for a purpose to be hereinafter explained.

At the opposite side of the branch 7 of the mentioned base plate the arm 9 is provided means of a spring 16, the same having one end connected at 17 to the arm, while at 18 the opposite end of the spring is connected with an integral web 19 tween the base plate 6 thereof. O n th tail whereby under the action of the spring 16 the hammer of the arm will be brought with force against a suitable detonator or percussion cap when placed in the cup 14: of the anvil 15. In this manner the detonator or cap will be in stantly exploded as will be understood. The screw 20 is capable of being adjusted in a vertical direction upon the sash so that if the occupant desires the upper sash may lowered to a given extent tilation, while when lowered beyond a given extent the necessary cooperation of the described instrumentalities will be set up to produce an audible warning.

The arm 9 is provided with a perforation 21 which is adapted to receive the upper extremity of the spring 16 to hold the arm in an inactive position. In order to accommodate such adjustments of the spring the r spring can be extended whe. detached from its normal position from the arm. This arrangement becomes necessary at times for the purpose of convenience when cleaning the windows and it permits of the sashes to be adjusted in the frame without the alarm device forming an obstruction to such adjustments.

What is claimed as new is 1. A burglar alarm comprising a plate adapted to be secured to the lower sash of a window, an anvil rising from the plate, a vertical branch rising from the plate in spaced relation to the anvil, a detonating arm supported for tilting movement in the branch and provided with a hammer adapt ed to co-act with the anvil, a spring for moving the arm in the direction of the anvil, a tail portion formed on the arm and extending in the direction of the upper sash, and means adapted for connection with the upper sash to move the arm against the action of the spring, the arm having a series of perforations therein and said spring being adapted for interchangeable connection with said perforations, as and for the purpose set forth.

2. A. burglar alarm comprising a plate adapted to be secured to the lower sash of a window, an anvil rising from the plate, a vertical branch rising from the plate in spaced relation to the anvil, a detonating arm supported for tilting movement in the branch and provided with a hammer adapted to co-act with the anvil, a spring for moving the arm in the direction of the anvil, a tail portion formed on the arm and extending in the direction of the upper sash, and vertically adjustable means adapted for connection with the upper sash to move the arm against the action of the spring, the arm having a series of perforations therein for the interchangeable connection therewith of said spring so that under the action of the spring, the arm may be respectively held in difierent positions with relation to said vertically adjustable means.

copies a; this patent may be obtained for five cents each,

8. A burglar alarm comprising a plate adapted to be secured to the lower sash of a window, an anvil rising from the plate, a vertical branch rising from the plate in spaced relation to the anvil, a detonating arm supported for tilting movement in the branch and provided with a hammer adapted to co-act with the anvil, a spring for moving the arm in the direction of the anvil, a tail portion formed on the arm and extending in the direction of the upper sash, and means adapted for connection with the upper sash to move the arm against the action of the spring, the tail having a per fora-tion therein, the spring having detach able connection with the arm and adapted to engage in the perforation of the tail to hold the latter inoperative relatively of the comprising a plate to the lower sash of from the plate,

from the a. A burglar alarm adapted to be secured a window, an anvil rising a vertical slotted branch rising plate in spaced relation to the anvil, a detonating arm supported for tilting movement in the branch and provided with a hammer adapted to co-act with the anvil, the arm having a tail portion provided with a perforation, said tail portion disposed be yond one side of said vertical branch of the plate, the said arm having a second perforation at the other side of said vertical branch of the plate, a device adapted for connection with the upper sash for co-acting with the tail portion of the arm to movev the latter in one direction, and a spring secured at one end to the plate and having its opposite end designed for interchangeable connection with the perforations, a slot inthe vertical branch serving to permit of the passage of the spring therethrough when.

the spring is engaged with the perforation in the tail portion of the arm.

In testimony whereof I afliX my signature.

SOLOMON BROOK.

by addressing the tioniniiesiener or Eatents.

Washington, Q. 

